angie wilkin son has dropped nearly 30 pounds. she now walks for her brother who died of heart failure in march. >> the day he died he told me how proud he was because i stuck with it. >> reporter: for linda, the walks are just a warmup. >> good job! >> reporter: every saturday, entrance to her gym is free. she also leads a nutrition class complete with a dietitian and a field trip to the grocery store. >> that's where you're going to get a lot of different nutrients. >> we're going to be an example. from the fattest to the fittest. i like that! >> reporter: and while this town has already lost thousands of pounds, they've gained a lot more in return. >> you're great for continuing on. >> reporter: kelly cobiella, cbs news, vicksburg, mississippi >> couric: and that's the "cbs evening news," i'm katie couric. thanks for watching. good night. captioning sponsored by cbs